1.WHICH TYPE OF CONNECTION TO BE PREFERABLE IN FIELD TO REDUCE COST?
BOLTED CONNECTION IS PREFERABLE WHEN COMPARED TO FIELD WELDING.
*.FIELD WELD IS SO COSTLY THAN FIELD BOLTING.
2.PLEASE DRAW COLUMN WITH BASE PLATE CONNECTION?
1.
Bottom of base
plate elevation.
2.
Orientation
mark of the column.
3.
Column to base
plate weld.
4.
Locations of
the holes in base plate with respect to the column center line.
5.
Hole diameter
and number of holes in base plate.
6.
Base plate
thickness.
3.WHAT IS THE HOLE SIZE IN BASEPLATE FOR 3/4 DIA TO 2 1/2 DIA ANCHOR RODS?
Size of Anchor – Rod Holes In
Base Plates
|
|||
|
Anchor Rod Dia |
Max. Hole Dia As per
LRFD |
Hole Dia
As per
ASD |
|
|
3/4 |
1 5/16 |
1 1/16 |
|
|
7/8 |
1 9/16 |
1 3/16 |
|
|
1 |
1 13/16 |
1 1/2 |
|
|
1 1/4 |
2 1/16 |
1 3/4 |
|
|
1 1/2 |
2 5/16 |
2 |
|
|
1 3/4 |
2 3/4 |
2 1/4 |
|
|
2 |
3 1/4 |
3 |
|
|
2 1/2 |
3 3/4 |
3 1/2 |
|
|
Larger holes are permitted if Plate Washers Used. |
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4.WHAT IS THE USE OF LEVELLING PLATE?
Normally thickness of leveling plate will be ¼ -in. The leveling plate may be larger than the base plate to accommodate tolerance of Anchor Rod placement.
5.WHAT IS THE USE OF PLATE WASHER?
The oversize holes should be covered with a heavy plate washer. The minimum thickness should be one-third the diameter of the anchor rod
6.WHAT IS THE GRABRAIL EXTENSION FROM LAST TREAD ?
1'-0
